Structure-activity relationships of receptor binding of 1,4-dihydropyridine derivatives


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Takahashi D., Oyunzul L., Onoue S., Ito Y., Uchida S., ŞİMŞEK R., ...Daha Fazla

BIOLOGICAL & PHARMACEUTICAL BULLETIN, cilt.31, sa.3, ss.473-479, 2008 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 31 Sayı: 3
  • Basım Tarihi: 2008
  • Doi Numarası: 10.1248/bpb.31.473
  • Dergi Adı: BIOLOGICAL & PHARMACEUTICAL BULLETIN
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.473-479
  • Anahtar Kelimeler: 1,4-dihydropyridine, hexahydroquinoline derivative, structure-activity relationship, L-type calcium channel antagonist receptor, CALCIUM ANTAGONISTIC ACTIVITY, DIHYDROPYRIDINE ANTAGONISTS, CHANNEL ANTAGONISTS, URINARY-BLADDER, HUMAN-PROSTATE, RAT, BRAIN, HEXAHYDROQUINOLINE, CILNIDIPINE, BLOCKADE
  • Hacettepe Üniversitesi Adresli: Evet

Özet

The present study was undertaken to investigate binding activity of synthesized 1,4-dihydropyridine (1,4-DHP) derivatives (Compounds 1-124) to 1,4-DHP calcium channel antagonist receptors in rat brain. Sixteen 1,4-DHP derivatives inhibited specific (+)-[H-3]PN 200-110 binding in rat brain in a concentration-dependent manner with IC50 value of 0.43 to 3.49 mu M. Scatchard analysis revealed that compounds 54, 69, 85, like nifedipine, caused a significant increase in apparent dissociation constant (K-d) for (+)-[H-3]PN 200-110, while compounds 68, 69 and 80 caused a significant decrease in maximal number of bindings sites (B-max). These data suggest that compounds 68, 69 and 80 exert longer-acting antagonistic effects of 1,4-DHP receptors than compounds 54, 69 and 85. The structure-activity relationship study has revealed that 1) ester groups in 3- and 5-positions are the most effective, 2) the aryl group in the 4-position of 1,4-DHP ring is the basic requirement for optimal activity, 3) position and type of electron-withdrawing groups on phenyl group at position 4 would affect the receptor-binding activity. Furthermore, compound 58 exerted alpha 1 receptor binding activity, being 1.6 times greater than 1,4-DHP receptors. Compounds 81, 84, 91, 94, 106, 108 and 109 showed significant binding of ATP-sensitive potassium (K-ATP) channel, and the binding activities of compounds 81, 84, 108 and 109 were 1.6-3.8 times greater than the binding activity for 1,4-DHP receptors. Compounds 91 and 106 had similar binding activity for K-ATP channel and 1,4-DHP receptors. In conclusion, the present study has shown that novel 1,4-DHP derivatives exert relatively high binding affinity to 1,4-DHP receptors and has revealed new aspect of structure-activity relationships of 1,4-DHP derivatives, especially hexahydroquinoline derivatives.